AES - The utility fell after tallying third-quarter revenue below expectations. Competitor Ameren also dropped after reporting quarterly results short of estimates, as did Entergy. Northeast Utilities declined ahead of its earnings report after the close.

Cott - The Canadian beverage maker rose after saying it would buy DSS Group in a deal valued at around $1.25 billion to expand into water and coffee delivery.

Allergan - The Botox maker rose after saying it's in merger discussions with an unidentified company as it tries to tend off a hostile takeover by Valeant Pharmaceuticals.

Apple - The consumer-technology company edged lower after saying it had identified and blocked malicious software applications targeting users in China.

BroadSoft - The telecom-software company climbed after Raymond James raised its rating to a strong buy.